WooCommerce Expert to Create Date Range Slider from Numeric Product Attributes (Dates) + WooCommerce Debug

URL: [login to view URL] 1. Slider ---------- Please check out the website above. It's for a car dealership which sells cars of different makes, years and types. On the landing page, we offer the user the option to input their preferences (price range, year, vehicle type) and we process the query and produce search results. We have WooCommerce products (cars) which have various characteristics and attributes (price, mileage, registration year). We also have a price slider (default and basic WooCommerce Price Range slider) [see "1. Price [login to view URL]"]. We want to be able to present the REGISTRATION YEAR as a slider as well AND sort out cars according to registration years in shop search results. Currently the years appear as DropDown menu, where you can only select one year (see "2. Registration Year"). We need this to be changed into a slider similar to the Price Slider. That is So we have two problems to be sorted for the slider: (a) Car Registration date attributes to be presented as slider, similar to the price slider we have. This needs to happen dynamically. That is, as with price slider, the code should detect minimum and maximum value from existing products and input into slider automatically. (b) Depending on the MIN and MAX values from the slider, produce products/cars within that range in the search results. Currently, we can only show results for one year. Should be able to show search results based on the range. BUG/FIX ----- Please refer to "3. [login to view URL]" Th Price Range slider that we have is no longer working properly because of the function being used outside of class (see '4. Bug-Fix [login to view URL]'). Worked before but no longer working. We have manually inputted the MIN and MAX values at the moment. The 'WC_Widget_Price_Filter::get_filtered_price()' function is no longer working (line 238).